Discussion
Assertion (A): Adjusting the first stage nozzle throat area rematches an engine effectively.
Reason (R): The choked throat fixes the corrected mass flow independently of downstream conditions.
Select the correct answer from the options below.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Because the throat is choked, its area alone fixes the corrected mass flow the engine will pass, and nothing downstream can alter it. Opening the throat lets the engine swallow more, which lowers the compressor working line and increases the surge margin; closing it does the reverse. A small change of area is therefore a powerful and precise rematching tool.
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